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As a Premium Member of Geocaching.com, you now have the ability to rate your favorite geocaches of all time.

Premium Members earn Favorite Points at a rate of 1 for every 10 geocaches found, and past finds contribute to the point total. By awarding a point to a favorite cache, you help call attention to the highest quality caches in your area and reward cache owners for placing exceptional caches.

The Favorite Points earned by a cache are tallied and displayed on each cache page and in the search results for everyone’s benefit. Premium Members have the additional perk of sorting search results by the most Favorited caches.
I like this idea, actually I started working on the same project, now I don't have to